ABINGDON, Va. — K-VA-T Food Stores here is completing a major overhaul of its data warehouse system and is about to apply that system to several new initiatives, including fresh item management and loyalty marketing. The data warehouse, from Teradata, Dayton, Ohio, will provide much more “granular” transaction data that offers “more insight into what’s happening in our stores” during specific parts of the day, said Paul Widener, director of information services, K-VA-T. Previously, the data a